package com.hmdp.utils;

import cn.hutool.core.io.resource.ClassPathResource;
import cn.hutool.core.lang.UUID;
import org.springframework.core.io.Resource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILcok{


    private StringRedisTemplate stringRedisTemplate;
    private String name;
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true) + "-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation((Resource) new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }
    public SimpleRedisLock( String name, StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
        this.name = name;
    }
    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识
       String threadId =ID_PREFIX+ Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX+name, threadId+"", timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
        //1312313131
    }

    @Override
    public void unlock() {
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREFIX+name),
                ID_PREFIX+Thread.currentThread().getId()

        );
    }

    }

//    @Override
//    public void unlock() {
//        //获取线程标识
//        String threadId =ID_PREFIX+ Thread.currentThread().getId();
//        //判断是否是当前线程
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX+name);
//        //判断是否是当前线程
//        if(threadId.equals(id)){
//        //释放锁完成
//        stringRedisTemplate.delete(KEY_PREFIX+name);
//    }}
//}
